Debian dla-4681 : p7zip - security update

#%NASL_MIN_LEVEL 80900
#
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory dla-4681. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(326550);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/13");

  script_cve_id(
    "CVE-2026-48092",
    "CVE-2026-48095",
    "CVE-2026-48101",
    "CVE-2026-48102",
    "CVE-2026-48103",
    "CVE-2026-48104",
    "CVE-2026-48111",
    "CVE-2026-48112"
  );

  script_name(english:"Debian dla-4681 : p7zip - security update");

  script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing one or more security-related updates.");
  script_set_attribute(attribute:"description", value:
"The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the
dla-4681 advisory.

    - -------------------------------------------------------------------------
    Debian LTS Advisory DLA-4681-1                [email protected]
    https://www.debian.org/lts/security/                      Sylvain Beucler
    July 13, 2026                                 https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : p7zip
    Version        : 16.02+really26.01+dfsg-0+deb11u1
    CVE ID         : CVE-2026-48092 CVE-2026-48095 CVE-2026-48101 CVE-2026-48102
                     CVE-2026-48103 CVE-2026-48104 CVE-2026-48111 CVE-2026-48112

    Multiple memory corruption vulnerabilities were discovered in p7zip, a
    now unmaintained fork of 7-Zip, which itself is a file archiver
    handling multiple formats.

    To address these security vulnerabilities, whose fixes are
    unfortunately not isolated, this update again replaces p7zip with a
    recent 7-Zip (now v26.01), slightly modified to make it reasonably
    compatible with p7zip.

    CVE-2026-48092

        SquashFS Fragment Offset Overflow

    CVE-2026-48095

        Heap Buffer Write Overflow

    CVE-2026-48101

        UEFI Capsule uninitialized heap memory disclosure

    CVE-2026-48102

        UDF Field OOB Read

    CVE-2026-48103

        WIM SecurityId OOB read

    CVE-2026-48104

        SquashFS BlockToNode uninitialized heap read

    CVE-2026-48111

        UEFI DEPEX OOB Read

    CVE-2026-48112

        Ar SYMDEF OOB Read

    For Debian 11 bullseye, these problems have been fixed in version
    16.02+really26.01+dfsg-0+deb11u1.

    We recommend that you upgrade your p7zip packages.

    For the detailed security status of p7zip please refer to
    its security tracker page at:
    https://security-tracker.debian.org/tracker/p7zip

    Further information about Debian LTS security advisories, how to apply
    these updates to your system and frequently asked questions can be
    found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/source-package/p7zip");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-48092");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-48095");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-48101");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-48102");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-48103");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-48104");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-48111");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-48112");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bullseye/p7zip");
  script_set_attribute(attribute:"solution", value:
"Upgrade the p7zip packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:N/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-48092");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/06/04");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/13");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:p7zip");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:p7zip-full");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:11.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Debian Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l");

  exit(0);
}

include('debian_package.inc');

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);

var debian_release = get_kb_item('Host/Debian/release');
if ( isnull(debian_release) ) audit(AUDIT_OS_NOT, 'Debian');
debian_release = chomp(debian_release);
if (! preg(pattern:"^(11)\.[0-9]+", string:debian_release)) audit(AUDIT_OS_NOT, 'Debian 11.0', 'Debian ' + debian_release);
var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Debian', cpu);

var pkgs = [
    {'release': '11.0', 'prefix': 'p7zip', 'reference': '16.02+really26.01+dfsg-0+deb11u1'},
    {'release': '11.0', 'prefix': 'p7zip-full', 'reference': '16.02+really26.01+dfsg-0+deb11u1'}
];

var flag = 0;
foreach package_array ( pkgs ) {
  var _release = NULL;
  var prefix = NULL;
  var reference = NULL;
  if (!empty_or_null(package_array['release'])) _release = package_array['release'];
  if (!empty_or_null(package_array['prefix'])) prefix = package_array['prefix'];
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (_release && prefix && reference) {
    if (deb_check(release:_release, prefix:prefix, reference:reference)) flag++;
  }
}

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : deb_report_get()
  );
  exit(0);
}
else
{
  var tested = deb_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'p7zip / p7zip-full');
}